CPS 1001/S/13.56MHz RF POWER SUPPLY - PTB Sales

CPS-1001/S13.56MHz
FP0213RK
CPS 1001/S/13.56MHz
RF POWER SUPPLY
Operator’s Manual
Copyright © 2004 by Comdel, Inc.
The information contained in this manual is proprietary to Comdel, Inc. and is protected by copyright and trademark laws.
You may not modify, copy, reproduce, republish, post, transmit, or distribute in any way any material from this manual except as may be
expressly permitted in writing by Comdel, Inc.
Comdel, Inc. • 11 Kondelin Road, Gloucester, MA 01930 • Phone: 800-468-3144 • www.comdel.com

Table of Contents
I. Safety Information..................................................................2
II. Description / Specifications....................................................5
A. Electrical Specifications
B. Protection Features
C. Generator I/O Requirements
D. Mechanical Specifications
E. Environmental Specifications
F. Testing Specifications
G. Packaging and Shipping Specifications
III. Unpacking and Inspection.....................................................9
IV. Maintenance............................................................................9
V. Preparation For Use...............................................................9
A. Power Requirements
B. Cooling Requirements
C. Installation Procedures
VI. Operating Instructions .........................................................10
A. Local Operation
B. Remote Operation
C. Test Equipment List
VII. Theory of Operation.............................................................11
A. DC Power Supply
B. Oscillator Control Board
C. Driver
D. PA1000 Power Amplifier
E. Directional Coupler
F. CPS Meter Board
VIII. Adjustments and Calibration............................................13
A. Over Voltage / Over Current Adjustment
B. VSWR Adjustment
C. Output Power and Forward Monitor Calibration
D. Reflected Monitor Calibration
IX. Figures
FP0213RX
FP0213RX.drg
FA0105RX
FA0207RX
FA0401RX
FA0603RX
CPS 1001 / 13.56 MHz Block Diagram
CPS 1001 Control Drawing
13.56, 1 KW Standard Directional Coupler
1 KW / 13.56 MHz “S” Driver
Oscillator Control Bard 13.56 MHz Standard
Integrated Meter Assembly, Standard
1

NOTE: Before installing equipment, carefully read and familiarize yourself with the entire
operations manual. Observe and obey all WARNING and CAUTION notes provided.
I. Safety Information
Warning Label and Safety Marking Explanations:
The following symbols and terms may be found on an instrument or used in this manual.
The CE mark indicates compliance with all currently applicable directives and standards.
This label indicates a general warning or caution condition.
This symbol indicates the presence of high voltages in or around the unit.
This symbol indicates that the component or circuit is short circuit protected.
This symbol indicates the presence of RF energy in or around the unit.
This symbol indicates a protective earth ground connecting point.
This label indicates a
presence of high voltage in or
around the equipment, which
may cause sever injury or
death. All appropriate
precautions should be
observed when installing,
operating or servicing this
equipment.
This label indicates the presence
of Radio Frequency energy in
and around the equipment,
which may cause burns or other
injuries. All appropriate
precautions should be followed
when installing, operating or
servicing this equipment.
2

The WARNING heading used in this manual explains dangers that might result in personal injury or
death. Always read the associated information very carefully before performing the indicated
procedure.
The CAUTION heading used in this manual explains hazards that could damage the unit. Such damage
may invalidate the warranty.
MUST – This word is understood to indicate a mandatory condition.
HIGH VOLTAGE – Voltages greater than 50 volts DC or 25volts AC and known to cause death or
serious injury if contacted.
SERVICE – Any operation of maintenance, repair, calibration or similar activity other than the normal
operation of the unit.
QUALIFIED SERVICE TECHNICIAN, QUALIFIED ELECTRICIAN, QUALIFIED
PERSONELL These terms indicate persons specifically trained to install, service or other wise handle
electronic equipment of the character and hazard potential of this unit.
End User Labeling
The system installer should obtain and apply all appropriate safety and warning labels required by the
end user’s local fire department jurisdiction and Occupational Health and Safety Administration over
and above those supplied by the generator manufacturer.
Read And Understand This Section Fully Before Installing or Operating This Equipment.
WARNING: This equipment must be installed, operated and serviced only by trained, qualified
persons.
General Safety Requirements
• WARNING: Hazardous Voltages and RF voltages are present inside this unit, which may cause
injury or death. To prevent electrical shock and or RF burns, never operate this equipment with the
covers removed. Never operate without an appropriate cable connected between the RF output
connector on the rear panel and the load.
• CAUTION: There are no user or operator serviceable parts inside this equipment. Refer all
service to a qualified service technician.
• This equipment must be bonded to Protective Earth (safety ground) prior to operating the unit.
Safety ground connection must be made at the unit’s rear panel designated 1/4”- 20 threaded
ground stud. The ground wire should be a #14 awg or equivalent (minimum) green/yellow lead.
• Replace fuses only with identical type and rating parts. Installation and connection of this
equipment must only be performed by a qualified electrician.
• HEAVY OBJECT CAUTION: A heavy object caution exists for equipment weighing more that
51 lbs or 23 kg. Use lifting aids to install unit, such as chain lifts or hooks and straps, attached to
the four handles at the sides and front of unit. Guide unit into final location using care to keep
hands and body parts clear of unit.
3

CE Mark Specific Safety Requirements
• This equipment meets all applicable safety directives (as specified in prEN50178) required to qualify
for the application of the CE marking.
• This equipment must be installed in accordance with the applicable requirements, or prEN50178
and EN60204-1 / IEC-204-1.
• This equipment is qualified to operate at Pollution Degree II and Insulation Category II.
• The installation of this equipment must assure that the AC power input connector (UL/CSA) is not
accessible to the user/operator. Access may be gained only by a qualified service technician. AC
Mains connector installation must be in accordance with local requirements.
• This unit provides appropriate separation between all interface, mains and output circuits in
accordance with 5.2.18 of prEN50178.
Interlock System
• The low voltage (24 V) safety interlock circuit is designed to disable the unit in the event of an
interlock fault condition. At a minimum, interlock protection is located at the removable top cover,
bottom cover and RF output connector safety cover.
• End user’s system should provide indication to the operator of the interlock fault condition.
• Low voltage power for the interlock circuit is supplied by a step down transformer located inside
the unit. This transformer is designed to provide safe low voltage operation and provide isolation
from the main AC line.
Lockout/Tagout
Prior to performing system maintenance, repair or other service operations the generator must be locked
out and tagged out to prevent accidentally energizing the system.
The following steps should be performed only by a qualified service technician:
• Disconnect AC input power to the generator.
• Mount a suitable “Clamshell” type lockout device to the AC input plug such as a Hubbell # HLD2
or equivalent. Follow all manufacturers’ directions for the lockout device.
• Secure the lockout device with an appropriate padlock or safety lock.
• Apply a lockout warning tag to the lock out device.
The Lockout / Tagout device should not be removed until system service is completed and it has been
determined appropriate to reconnect and operate the generator.
4

II. Description / Specification
The CPS-1001/S/13.56MHZ is a RF Generator operating with a center frequency of 13.56 MHz. The
power source produces maximum transfer of power into a 50 ohm resistive load, yet it is designed to
withstand large deviations in load impedance without failure.
The primary features of the CPS-1001 series are its solid-state design, small physical size and
reliability.
The CPS-1001 series amplifier is constructed with two main sections. The DC power section includes
all of the filter capacitors, rectifiers and regulators, as well as the three-phase 208 VAC power
transformer. Transformers to accommodate other line voltages are available through special order. The
rectifiers and bleeder resistors are mounted on a water-cooled copper heatsink. These components are
operated at about half of their rated outputs to insure the high reliability of this section. The RF section
consists of the oscillator control board (OCB), driver, PA 1000 power amplifier, combiner and
directional coupler assembly. The driver and power amplifier modules are mounted on water-cooled
heatsinks. All components are used well below their dissipation ratings for long life and low
maintenance operation.
The CPS-1001 is enclosed in a standard 19” rack mounted chassis. The chassis is 5.25” high and
16.125” deep (See the Control Drawing for further mechanical detail).
NOTE: This product is subject to a “Copy Exact” agreement that requires written notification to the
contract specialist prior to implementing any PART or PROCESS Changes.
A. Electrical Specifications
1. A/C Input Voltage: 180-229 VAC, 49-61Hz, three phase, NO NEUTRAL
2. Line Current Protection: 10 Amp, 3 pole circuit breaker.
3. Output Power: (within specified range of line voltage)
3.1 0 to 1.0 KW continuous forward power into a 50 ohm load, 0 degrees nominal phase.
3.2 0 to 1.0 KW continuous forward power into a plasma load of complex impedance
with appropriate matching network.
3.3 Forward power out to track command setpoint for reflected power less than 200 watts.
4. Generator frequency: 13.56 MHz
5. Frequency stability: +/- .005%
6. Load Mismatch: Continuous operation into any load mismatch. Automatic forward power
limiting above 200 watts reflected power.
7. Harmonic distortion: All harmonics minimum 30 db below fundamental at full power
8. Accuracy / Linearity / Regulation/ Stability:
Setpoint Zero Offset: - 2% of full scale max
Input to Output Linearity: +/- 3% of setpoint from 10-100%
Input to Output Accuracy: +/- 3% of setpoint from 10-100%
A/C Line Regulation: 2% max output change over rated voltage
Forward Power Regulation: +/- 5% of setpoint max for load variations from 1:1 to
5

1.5:1 VSWR within foldback limits
Short Term stability: +/-1%/hr
Long term stability: +/-5% over three years continuous output
Zero Setpoint: less than 5 watts actual output power and less than 5 watts readback
power when setpoint signal is at zero or at a negative voltage.
NOTE: Use RF enable switch (Pins 4-9) 15 Pin D to ensure zero output power.
B. Protection Features
1. Mismatch Protection: Continuous operation into any impedance mismatch condition
without damage or malfunction; forward power foldback shall occur within 500us if
reflected power exceeds 150 Watts.
2. Output power connection interlock: Hard-wired interlock that disables the input AC
power contactor upon removal of the output cable.
3. Safety interlock: Disables the input AC power contactor via the connector. MAX external
loop resistance of 5.0 ohms .
4. Over Temp Fault: Output disabled on high internal temperature
5. Short Circuit Fault: Output limiting protection under short and open circuit conditions.
6. Overdrive Limit: Internally limited at 1100 watts.
7. Control signal protection: Unit not to be damaged if a short circuit or up to 30 volts AC or
DC is placed between any input signal, return signal, and ground.
C. Generator I/O Requirements
1. Signal input impedance: 10K ohms, min.
2. Signal input isolation: 1000 VAC MIN to the A/C supply line.
3. Line connections: Linecord to be 14AWG 4 conductor (three phase & ground); linecord
jacket material to be type "STO" gray; linecord to be crimped to NEMA L15-20P style
plug; linecord length to be 4.5 ft. +/-6.0 inches as measured from the rear panel exterior to
the strain relief end of plug. Reference MARINCO part number 2015P-AM1.
MARINCO: One Digital Dr.
Novato, CA 94949
(415) 883-3347
4. RF Output power Connector: One type "N" female coaxial connector
5. Control connector: 15 pin subminiature "D" type, (female).
6. Control signals and pinout:
Pin 5: Power setpoint
Pin 3: Forward power out
Pin 2: Reflected power out
0 to +10 VDC = 0 to 1.0 KW linear
0 to +10 VDC = 0 to 1.0 KW linear
0 to +10 VDC = 0 to 1.0 KW linear
6

Pin 4: Power enable
Enables the output oscillator with an external contact
closure between pins 4 and 9 (24 VOLTS, 0.5 AMPS
MAX SWITCHING)
Pin 9: Power enable Common for Pin 4
Pin 11: Safety interlock
Enables the input A/C power contactor with an external
contact closure to Pin 12. (24 VOLTS, 0.5 AMPS MAX
SWITCHING).
Pin 12: Safety interlock common.
Pin 6: Signal common
Pin 7: Power on indicator
+5 VDC source when RF Power is on
Pin 8: Power on common Common for Pin 7
D. Mechanical Specifications
1. Size: 17" W x 5.25" H x 16.125" D max.
2. Mounting: Standard 19" rack.
3. Cooling: 1.5 G.P.M. MIN, 35 degrees C MAX 25% glycol mix MAX
4. Water connections: 1/4 NPT female, inlet and outlet.
5. Front panel indicators:
5.1 Power meters: Dual meters to indicate forward and reverse power.
5.2 Power on indicators: Visible green LED to indicate A/C power on.
5.3 Fault indication: Visible red LED to indicate temp fault.
6. Handles: Two handles (left and right) to be mounted on the front panel exterior, evenly
spaced on center, dimensioned
7. Color: Front panel to be black with contrasting white alpha/numeric designators.
8. Warning Labels:
8.1 Safety Labels for hazardous voltages, Heavy Object, and Caution for lifting by
water fittings are to be provided on operator visible areas of the generator. IEC
standard symbols in user visible areas for start, stop, enable and cautionary
conditions, PE ground, high temperatures and RF energy present.
8.2 Special marking available at customers specifications
E. Environmental Specifications
1. Operating Temperature & Humidity
1.1 Operating ambient temperature/humidity/air pressure: 10 to 40° C, 5 - 85%
humidity (non-condensing, no formation of ice), 86-106 kPa. Class 3k3 per
prEN50178.
7

1.2 Inlet Water Cooling Requirements: 1.5 GPM @ 690 kPa (100 psi) max, 35° C
Max.
1.3 Coolant type: Water
2. Storage and Transportation
2.1 Storage temperature/humidity/air pressure: -25 to +70° C (class 1k4 per
prEN50178), 5 - 95% humidity (non-condensing, no formation of ice, class 1k3),
70-106 kPa (class 1k4).
2.2 Transport temperature/humidity/air pressure: -25 to +70° C, 5 - 95% humidity,
70-106 kPa (class 2k3).
3. This equipment has been designed to be compliant with FCC Part 18 emission standards
for EMI/RFI radiation. Radiated emissions shall also not exceed maximum levels
permitted by ANSI C95.1-1982 standards on safety levels with respect to human exposure
to RF and electromagnetic fields from 300KHz to 100GHz.
F. Testing Specifications
1. Production Acceptance Test: Each unit will be required to "pass" production acceptance
testing and a "Final Test Report" will be generated to document results.
1.1 Production Acceptance Testing process shall include as a minimum: Complete
Parametric/Functional Tests covering: line regulation, calibration, linearity, burnin,
over-temp test, open circuit test, MAX power test, harmonic distortion, AC
ripple, and remote interface tests. Data sheet for each generator to be shipped
with unit.
G. Packaging & Shipping Specifications
1. Accessories Supplied
1.1 Final test results
1.2 Operating manual
2. Shipping
NOTE: If there is a conflict between this document and customer Purchase Order
then the latter supersedes.
NOTE FOR REPAIRS: Unless repairs have accessories included with them and
have them listed on the Return Material Authorization (RMA) Tag, returned materials
will not have to fulfill procedural requirements for accessories.
8

III. Unpacking and Inspection
1. Carefully unpack the unit and inspect for any obvious signs of physical damage that might
have occurred during shipment. Notify the shipping agent of any damage immediately.
2. Check the outside of the unit for missing or loose mounting screws or broken parts.
3. If there is shipping damage or the unit fails to operate properly upon receipt, report
damage to the carrier and Comdel immediately.
CAUTION: Breaking the seal or removing the warranty decal from this unit will void the
warranty. If internal damage is suspected, contact factory for assistance.
IV. Maintenance
The CPS-1001 is designed to run unattended for long periods of time. Should service be
required, the system is modularly designed for quick repair. The whole RF section could be
replaced in less than thirty minutes.
After a time, scale may build up on the inside of the cooling tubes. This could greatly reduce
the cooling capacity of the system. It is recommended that the system be flushed with a
descaling agent. A cleaning agent that does not damage copper, brass, stainless steel and nylon
tubing should be chosen.
V. Preparation for Use
A. Power Requirements
The CPS-1001 is designed to operate from a 208 VAC three phase line. The system will
function within specifications when line voltage fluctuates between 185 and 230 volts.
However, voltages over the recommended 208 VAC reduce the safety margins designed into
the system and should be avoided. Lower voltages impact power output and regulation. The
system draws a maximum of 8 amps per phase (at 208Vac line) when used to drive a load of 50
ohms. Under conditions of mismatch, the amplifier could draw slightly more current.
Nominal Input:
208 VAC, 3 Phase
50/60 Hz
8 Amps
This system utilizes 3 wire plus ground (no neutral) wiring.
B. Cooling Requirements
The CPS 1001 requires 6 liters/minute (1.5 gallons per minute) to cool sufficiently. The inlet
water pressure should not exceed 60PSI. Water temperature should not exceed 35° C, and
should not fall below a temperature where excess condensation could develop within the unit.
The ambient air temperature of the generator should not exceed 35° C. There should be
enough room over the top of the amplifier and along the sides to permit unobstructed airflow
through and around the unit.
9

C. Installation Procedures
1. This equipment must be installed in accordance with the directives of PREN50178 and
EN60208-1 / IEC-208-1.
2. This equipment is qualified to operate at pollution degree II and installation category II.
3. This equipment is intended to be powered from a 208VAC, 3 Phase source. For use at
other voltages, a safety isolation transformer must be used to power this equipment in
accordance with the directives of EN60742 / IEC-742.
4. The installation of this equipment must assure that the AC power connector (UL/CSA) is
not accessible to the user/operator. Access may be gained only by a qualified service
technician.
5. Customer supplied AC mains connector installation to be in accordance with local
requirements
CAUTION: There are no user serviceable parts inside this equipment. Refer all service to a qualified
service technician.
VI. Operating Instructions
Operating and monitoring the CPS-1001 generator is accomplished either locally at the front panel or
remotely. A front panel toggle switch selects either local or remote control. The remote monitoring and
control interface is handled through the rear panel mounted 15-pin female “D” type connector, called J1.
A. Local Operation
1. Install 50 ohm coaxial load to output terminal of generator. Attach interlock sleeve on
output cable to capture output cable interlock. The generator is normally supplied with
Type N coaxial connectors. RG-8/u cable is sufficient to carry the output power from
generator to load. Load should have at least 1500W dissipation rating.
2. Pin 11 or rear panel connector J1 must be grounded to enable the main power contactor
(Pin 12 is ground). Pin 4 of rear panel connector J1 must be connected to Pin 9 (RF
enable).
3. With the front panel circuit breaker in the “OFF” position, attach the primary supply line
to the appropriate supply mains.
NOTE: Units are shipped wired for 208V, 3 phase, 50/60 Hz unless specified by
customer.
4. Place local/remote switch in “LOCAL” position.
5. Rotate power control knob fully counter-clockwise.
6. Check that cooling water is on.
7. Check to confirm that all cover and cable interlocks are satisfied.
8. Turn on the front panel circuit power breaker.
9. Turn power control knob clockwise until full power is indicated on front panel power
meter. (Reflected power will not indicate.)
10

B. Remote Control Operation
1. To control power remotely, a positive DC voltage must be applied to Pin 5 of J1 (Pin 6 is
the return.) Control voltage of 0 to 10V yields an output of 0 to 1000 watts. Voltages put
on this pin exceeding 10 volts will produce higher power up to a point. However, warranty
of the unit cannot be maintained if the unit exceeds its design rating of 1000 watts.
2. Forward and reflected power can be monitored remotely through Pins 3 and 2 respectively
(Pin 6 is the return). Forward power is related linearly to 0 to 5 VDC corresponding to 0
to 1000 watts. Reflected power relates 0 to 5 VDC linearly to 0 to 1000 watts. (Optional
0 to 10 VDC may be chosen for full scale power monitoring.)
C. Test Equipment List
Instrument Type
and Cables
Min. Req. Spec
Recommended Instruments
and Accessories
50 ohm Coaxial Resistor 1500W dissipation Bird Electronics Thermaline
coaxial Resistor #8860
Water Chiller 25-30 degrees C.
1.5 GPM min
Neslab Cool Flow
Refrigerator Recirculator
Model CFT-33XW
VII. Theory of Operation
The CPS-1001/S/13.56MHZ is a high frequency RF generator. The power source consists of three DC
Power Supplies, oscillator control board, driver, power amplifier, directional coupler and integrated meter
assembly. Schematic diagram dwg# FP0213RI is a compete system drawing down to the module level.
A. DC Power Supply (schem dwg# FP0213RI)
The DC supply consists of a three-phase transformer, a three phase full-wave, bridge rectifier,
and low-pass filter for the high current DC power supply. This supply is used primarily by the
driver and power amplifier (PA). There are two regulated low current power supplies. Both
are on the integrated meter assembly printed circuit board (+/- 15VDC). The +/- 15VDC
supplies are used in the oscillator control board (OCB) and on the integrated meter board.
The outputs of this stage are:
1 50 VDC max. Unloaded
41 VDC Loaded (1000 watts RF output)
1 +15 VDC Regulated 250 mA max.
1 -15 VDC Regulated 150 mA max.
B. Oscillator Control Board (schem dwg# FA0401RE)
The oscillator is a hermetically sealed crystal circuit clock oscillator with a frequency stability
of .01%. The signal from the oscillator is buffered and amplified by two stages of gain. This
signal is now fed into the OCB output stage. The output is a class “C” amplifier stage. Output
power of this stage varies from 0 to 1.0 watts by changing VCC. The VCC is changed via the
ALC (automatic level control) circuit. There are no trimming or adjustments required in the
RF part of the circuit due to its broadband and low “Q” matching networks.
The automatic level control (ALC) circuitry smoothes output power control and stabilizes
output power against line and load variations. Control is achieved through the MC34082
11

operational amplifier, U5A. This op-amp compares the forward power signal (from the
directional coupler board) to that of the DC reference signal applied to the non-inverting input.
The reference level is set either from the front panel potentiometer or from Pin 5 of the J1
connector.
When the reference is applied to the U5A, it drives the gain control transistor Q4, until the
squared forward power signal from the directional coupler is equal to the inverting input to the
op-amp provided by the reference. When the inverting signal equals the reference voltage on
the non-inverting input, the drive level holds constant.
The non-inverting input is the connection point for the protection circuits. The OCMA pulls
this point down when the load conditions force the amplifiers near their over-voltage, or overcurrent
limits. This limits the drive to the amplifiers until the match between the generator and
the load is corrected.
The reflected power limiter performs in the same way. When the signal from the reflected
power detector in the directional coupler reaches a pre-set limit, the U5B amplifier pulls -down
the reference line until the VSWR conditions are within safe limits.
The oscillator control board also includes linearizing circuitry, allowing both forward and
reflected analog power level signals to appear at connector J1 as linear representations of the
forward and reflected RF output power. Two squaring ICs (U2 and U4) are used to condition
the square law signals from the directional coupler.
Typical Specifications
(OCB)
Output load impedance
50 ohms
Output RF power level
1 watt (max)
Input power Pin 10 +15 VDC at 170 mA max
Pin 8
-15 VDC at 24 mA max
Remote power control input impedance
Pin 5 on J1
2 K ohm typical
Reflected power limit
Internally set to 200W reflected
C. Driver (schem dwg# FA0207R2)
The CPS-1001 driver consists of a two transistor “Class C” power amplifier stage. The output
stage of the driver feeds a splitter. The split signals are then used to feed the final power
amplifiers. With an input of 1.8 watts, a typical output would be 25 watts x2.
Typical Specifications
(Driver)
Gain
Input power
Output RF power
Driver Voltage*
Driver Current*
AC input
50 ohms
1.5 watts (max)
25 watts
42 VDC
3.5 A
208 V
* 1000 watts into 50 ohm resistive load
12

D. PA 1000/S Power Amplifier
The PA 1000 uses eight power bipolar transistors arranged in four pairs of push-pull class “C”
amplifiers. The input power from the driver is matched with a wideband transformer, T11 and
T13. The driver inputs are then split into two signals with T12 and T14 and fed into four pushpull
transformers T7-T8. Each of these four transformers drives the bases of two power
transistors. The transistors are operated common source with feedback.
The collector signals are coupled by a push-pull hybrid combiner T15, T18, T20, T23. The
outputs of these combiners are once again added together two two-way hybrid combiners.
There are no adjustments on the PA 1000/S.
Typical Specifications
(PA1000)
Gain
Input power
Output power
Input impedance
Output load impedance
Collector voltage *
Current draw *
18 dB
15 watts (typical)
1100 watts (min)
50 ohms
50 ohms
42 VDC
46 ADC
* At 1000 watt system output into 50 ohm resistive load
E. Directional Coupler (schem dwg# FA0105RC)
The directional coupler has two detectors that monitor forward and reflected power. The
directional coupler produces voltages, which are proportional to the square of both forward and
reflected power. The signals from the two detectors are produced from inductive (current) and
capacitive (voltage) taps off the output line. The forward power and reflected power signals
are fed into the OCB where they are linearized. They are then used to drive the front panel
meters and for remote output monitoring. The reflected power signal is only present when the
generator is driving a load that is not purely resistive, or not 50 ohms. This signal is also used
to drive the VSWR shutdown circuitry.
F. CPS Meter Board (schem dwg # FA0603RE)
The CPS meter board is the major connection and routing point in the CPS generators. It is
also the location for the +/- 15vdc and +12vdc power supplies, interlock transformer, over
voltage (OV) and over current (OC) foldback circuits, enable circuit and over temp circuit.
VIII. Adjustments and Calibration
The only adjustments required on the CPS-1001/S are made to the monitoring and transistor
protection circuitry. All of these adjustments have been performed at the factory and generally
will never have to be readjusted.
CAUTION: Unauthorized resetting of any adjustments will void the warranty.
A. Over Voltage / Over Current Adjustment
The OV OC potentiometer adjustments are located on the CPS meter board (R22 and R21).
These adjustments should be altered only when the generator is operating into a 50 ohm real
load. The procedure for adjustment is as follows:
13

1. Install 50 ohm coaxial cable from the output of the generator to the input of a RF
wattmeter, and from the meter to a 50 ohm coaxial load. The generator is normally
supplied with Type N coaxial connectors. RG-8/u cable is sufficient to carry the output
power from generator to load. Load and RF wattmeter should have at least 1500W
dissipation rating.
2. Pin 11 of rear panel connector J1 must be grounded to enable the main power contactor
(Pin 12 is ground). Pin 4 of rear panel connector J1 must be connected to Pin 9 (RF
enable).
3. With the front panel circuit breaker in the “OFF” position, attach primary supply line to
appropriate supply mains.
NOTE: Units are shipped wired for 208V, 3 phase, 50/60 Hz, unless specified by
customer.
4. Place local/remote switch in “LOCAL” position.
5. Rotate power control knob fully counter-clockwise.
6. Check that cooling water is on.
7. Turn on front panel main power breaker.
8. Turn power control knob clockwise until full power is indicated on front panel power
meter. Reflected power will not indicate.
9. Turn R21 and R22 adjustments to their maximum counter-clockwise limit. Maximum
power should now be at least 1400W.
10. Start turning OC R21 adjustment clockwise until output power drops; then back off
adjustment ¼ of a turn.
11. Turn the OV R22 adjustment clockwise until output power drops to 1350W.
B. VSWR Adjustment
The VSWR set is located in the oscillator control board (OCB) and is adjusted by R1 (10 K
pot). Under high VSWR conditions Q6 is biased on and pulls the control voltage low. When
this circuitry is activated, the unit will limit output power until the high VSWR condition is
eliminated. The oscillator module is set to go into protected operation when there is 200W
reflected. The procedure for adjustment is as follows:
1. Install 50 ohm coaxial cable from the output of the generator to the input of a RF
wattmeter. Leave the other end of the wattmeter open circuited.
2. Pin 11 of rear panel connector J1 must be grounded to enable the main power contactor
(Pin 12 is ground). Pin 4 of rear panel connector J1 must be connected to Pin 9 (RF
enable).
3. With the front panel circuit breaker in the “OFF” position, attach the primary supply line
to the appropriate supply mains.
NOTE: Units are shipped wired for 208V, 3 phase, 50/60 Hz unless specified by
customer.
4. Place local/remote switch in “LOCAL” position.
14

5. Rotate power control knob fully counter-clockwise.
6. Check that cooling water is on.
7. Turn on front panel main power breaker.
8. Turn power control knob clockwise until 200 W is indicated on the RF wattmeter.
9. Turn adjustment until the reflected power indication on the wattmeter just starts to drop.
10. Slowly turn power control knob clockwise if the reflected power indicated on the
wattmeter starts to rise, then go to step 9. Repeat this loop until the power control has
reached its maximum setting.
C. Output Power and Forward Power Monitor Calibration
The CPS-1001/S has a DC voltage output proportional to forward power. This voltage is
factory adjusted for 5 VDC on J1 Pin 3 when the generator is running at 1000W forward into a
50 ohm load. (The forward power calibration can be optionally set at other levels.)
1. Install 50 ohm coaxial cable from the output of the generator to the input of a RF
wattmeter and from the meter to a 50 ohm coaxial load. The generator is normally
supplied with Type N coaxial connectors. RG8/u cable is sufficient to carry the output
power from generator to load. Load and RF wattmeter should have at least a 1500W
dissipation rating.
2. Pin 11 of rear panel connector J1 must be grounded to enable the main power contactor
(Pin 12 is ground). Pin 4 of rear panel connector J1 must be connected to Pin 9 (RF
enable).
3. With front panel circuit breaker in the “OFF” position, attach primary supply line to
appropriate supply mains.
NOTE: Units are shipped wired for 208V, 3 phase, 50/60 Hz unless specified by
customer.
4. Place local/remote switch in “LOCAL” position.
5. Rotate power control knob fully counter-clockwise.
6. Check that cooling water is on.
7. Turn on front panel main power breaker.
8. Turn power control knob clockwise until there is 10.00 VDC on the SETPT (set point) test
point in the oscillator control module (OCB).
9. Adjust the FWD OUT pot (R34) until there is 5 VDC at the R40 FO test point.
10. Set the CAL pot (R44) until there is 1000W displayed on the RF wattmeter.
11. Turn power control knob until there is 1.00 VDC on the SETPT (set point) test point.
12. Adjust the CAL ZERO pot (R56) until there is 100W displayed on the RF wattmeter.
13. Go to step 8. Repeat this loop until the generator outputs the correct power at the 1.00 and
10.00 VDC setpoints.
15

14. Set R2 on the meter board so that at the 10.00 VDC setpoint the FORWARD POWER
meter reads 1000W.
D. Reflected Monitor Calibration
The CPS-1001/S has a DC voltage output proportional to reflected power. This is set by the
following procedure:
1. Install 50 ohm coaxial cable from the output of the generator to the input of a RF
wattmeter. Leave the other end of the wattmeter open circuited.
2. Pin 11 of rear panel connector J1 must be grounded to enable the main power contactor
(Pin 12 is ground). Pin 4 of rear panel connector J1 must be connected to Pin 9 (RF
enable).
3. With the front panel circuit breaker in the “OFF” position, attach primary supply line to
appropriate supply mains. NOTE: Units are shipped wired for 208V, 3 phase, 50/60 Hz
unless specified by customer.
4. Place local/remote switch in “LOCAL” position.
5. Rotate power control knob fully counter-clockwise.
6. Check that cooling water is on.
7. Turn on front panel main power breaker.
8. Turn power control knob clockwise until 200 W is indicated on the RF wattmeter.
9. Adjust RFL OUT pot (R32) until the voltage at R28 RO is equal to the voltage at R40 FO.
10. Adjust R1 on the meter board until the REFLECTED POWER meter equals the setting on
the forward meter.
16